Martin boecker



(No Model.) I r 2 SheetsShet 1.

M. BOECKER. REGB-NERATIVE HOT BLAST STOVE.

N0.422,905. PatentedMarlLl890 (No Model.) 2 Sheets-Sheet 2.

M. BOEGKER. REGBNERATIVE'HOT BLAST STOVE.

No. 422,905. Pa tented Mar. 11, 1890.

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UNITED STATES PATENT OFFICE.

MARTIN BOEOKER, or FRIEDENSHUTTE, YPRUSSIA, GERMANY.

REGENERATIVE HOT-BLAST STOVE. 1

SPECIFICATION forming part of Letters Patent No. 422,905, dated March 111890.

Application filed April 8, 1889. Serial No. 306,469. (No model) T0 atwhom it may concern.-

Be it known that I, MARTIN BOEOKER, a

subject of the King of Prussia, residing at Friedenshiitte, nearMorgenroth, in the Kingdom of Prussia, Germany, have invented anImprovement in Regenerative Hot Blast Stoves, of which the following isa specification. I

This invention relates to an improvement 111 regenerative hot-blaststoves; and it consists in the various features of improvement morefully pointed out in the claim.

In the accompanying drawings, Figure 1 is a vertical section of myimproved hot-blast stove through the inlet and exit flues taken 011 theline 00 00, Fig. 2. Fig. 2 is ahorizontal section on line m w, Fig. 1.Fig. 3 is a vertical section taken on a plane at right angles to Fig. 1,through line 3 y, Fig. 4. Fig.- 4 is a horizontal section 011 line 1 y,Fig. 3. Fig. 5 is an enlarged horizontal section through portions of thechecker-work.

The regenerative hot-blast stove shown in the accompanying drawings isheated by blast-furnace gases. These gases pass at E into the flue F,combine with the air-supply, and the resulting flames rise through Finto the arched space F at the top of the stove, whence they descendthrough the passage is, formed in the filling, giving off their heat tothe latter, and escape at the bottom through the oppositedischarge-valve K to the chimney.

NVhen the filling of the stove is sufficiently heated, the supply ofblast furnace gases and air for combustion is cut off and cold air isadmitted at G, which air passes up through the channels of thehighly-heated filling, taking up heat therefrom, and descends throughthe flue 011 its way to the blast-furnace at G.

The original Cowper hot-blast stove with central inlet-passage had thedisadvantage that the flame and heatinggases passing down through thefilling left the outer portion thereof untouched, such portion being thegreater the larger the diameter and the smaller the height of the stove.On account of this fact, such Cowper stoves have lately been constructedof smaller diameter and greater height and with the inlet flue arrangedclosely against the one side of the stove, so that the filling receives(in plan) the shape of a crescent; but even with this construction theobjection exists that the heating-gases pass only imperfectly in contactwith those portions of the filling that lie to one side of the directline of draft of the chimneyfiue, which still produces a more or lessimperfect heating effect.

To accomplish a perfectly-uniform distribution it would be necessary tomake the passage of gradually-increasing sectional area on each side ofthe direct line of draft indicated by the arrow Z Z, Fig. 4:; but thisarrangement would entail considerable inconvenience and expense, and itis therefore preferred to make only a feW-say two or three-variations inthe area of the passages, as this gives practically a very perfectresult. The accompanying drawings show two such variations in the sizeof the passages, those situated in the middle in the line of the directdraft being made, for example, about six and three-fourths inchessquare, while those of the two side portions are made about seven andthree-fourths inches square.

I am aware that in the specification of Oochrame and Oowpers Englishpatent, No. 1,623 of 1874, it was proposed to effect a more uniformdistribution of the flames over the passages of the filling by formingat the upper ends of such passages contractions, which are made ofdifferent. areas, according to their position in the stove; and I do notclaim such an arrangement as part of my invention, the passagesconstructed according to my invention being of uniform size throughouttheir length, whereby the advantage is gained of preventing any materialdeposit of dust, such as would occur if the passages were made withcontractions.

What I claim is A regenerative hot-blast stove having inlet and outletlines on opposite sides, a vertical flue or uptake communicating withthe fines at one side and opening into a chamber at the upper part ofthe stove, and a filling of checker work having vertical passagestherethrough, each flue being of uniform. size throughout its length,and the pas- ICO sages between the inlet and outlet fiues being name tothis specification in the presence of of the same size, but the severalpassages on two subscribing Witnesses. each side of the central line ofpassages in- T creasing in size from the central line 0f MARIN} LOEOKER'5 draft outward, as and for the purpose set Witnesses:

forth.

MORITZ KNABE, FRIEDR. AUG. JACOBS.

In testimony whereof I have signed my

